Three-phase photovoltaic grid-connected inverter using dSPACE DS1104 platform

Abstract

This paper presents a simulation modeling for the hardware development of photovoltaic three-phase voltage source inverter utilizing dSPACE DS1104 controller platform. The controller links the MATLAB/Simulink simulated model to the inverter prototype for operation in real-time. It generates a sinusoidal pulse-width modulation (SPWM) signals for switching devices (IGBTs) with the accomplishment of fuzzy logic controller and Park transformation. Consequently, the inverter provides power not only to the local loads but also feeds the available excess power to the grid. The current and voltage control strategies which are implemented by using the fuzzy logic controller regulate the 50 Hz sinusoidal ac output current and voltage for both modes of operations namely isolated and grid-connected mode. The simulation was carried out with the PV generator simulator to facilitate the real PV power transfer to the local loads and grid. With the excellent results of 2.48% in the total harmonic distortion (THD) of output voltage, suggests that the proposed control system exhibits a good performance, thus can be translated into a prototype by utilizing the dSPACE platform. The simulation results waveforms such as ac output voltages, current and system power flow are presented to validate the efficacy of the control system.